Motor attachment for sewing machines



Feb. 23 1926. 1,573,932

B7 GROSSBARD I MOTOR ATTACHMENT FOR SEWING MACHINES Filed April 13 1925 INVENTOR WWII/7d 0 BY ya qmzm ATTORNEY Patented Feb. 23, 1926.

UNITED STATES 4 1,513,932 PATENT OFFICE.

BARNET GROSSBARD, OF SAN FRANCISCO, CALIFORNIA.

MOTOR ATTACHMENT FOR SEWING MACHINES.

Application filed April 13; 1925.- Serial No. 22,757.

To all whom it may concern:

Be it known that I, BARNET GROSSBARD, a citizen of the United States, residing in the city and county of San Francisco and State of California, have invented new and useful Improvements in Motor Attachments for Sewing Machines, of which the following is a specification.

This invention relates to motor attachments for sewing machines, and has for its principal object to provide a clutch. mechanism of novel construction, readily applied to the drive shaft of a motor and the operating wheel of the sewing machine.

Another object of this invention is to provide a motor attachment for sewing machines whereby the operating speed of the sewing machine may be conveniently regulated. A further object of the present invention is to provide a motor attachment for sewing machines, having therein a novel double gripping clutch mechanism adapted to satisfactorily control the speed at which the sewing machine is to operate.

Another object of the present invention is to provide a clutch mechanism adapted for use in connection with a sewing machine and a motor, whereby the sewing machine may be conveniently thrown into and out of operation and may be satisfactorily regulated as to speed.

Other objects, more or less apparent, will be disclosed and described in the following specification and shown in the accompanying drawing, in which:

Fig. 1 represents a side elevation of my attachment for sewing machines, showing the clutch mechanism thereof in cross section; and

Fig. 2 is a top view of the same.

' Referring to the drawings the numeral 1 designates a motor of the usual type and construction, having a driving shaft 2. Detachably secured to driving shaft 2 by means of set screws 3 is wheel 4 having secured to its inside surface near the circumferential edge thereof, gripping pad 5, which is constructed from leather or other suitable material. -The wheelvl is provided with a projection 6, which extends around and beyond the shaft 2. Fitting around projection 6 is fly wheel 7, provided on the inside thereof withgripping pad 8, and on the outside with driving pulley 9. The gripping pad 8 is circular in shape, and is of the same construction and shape as gripping pad 5, the former being secured to the inside surface of fly wheel 7 by means of glue or other suitable adhesive. Secured to the outer central part of fly wheel 7 by means of gripping projection 10, which is an integral part of the fly wheel, is knob 11. Located between the pads 5 and 8 and fitting over the inwardly projecting part 12- of fly wheel 7 is circular disc 13, which operates against the two pads in such a manner as to provide a double clutching mechanism. Fly wheel 7, the driving pulley 9, gripping projection 10 and projecting part 12, are integrally cast and constitute a single member. The motor 1 is attached to base 14 by bolts 15. The base 14 is provided with a projection 16, having therein a suitable recess for the insertion of bar 17. Bar 17 is held within projection 16 by means of set screw 18, and is adjusted by means thereof. Pivoted on bar 17 by means of pin 19 is lever 20, which has an extension 21 thereon. The extension 21 projects as far as knob 11 and is adapted to come in contact therewith. .Forming a part of bar 17 is member 22, to the end of which is attached one end of a spiral wire spring 23. The other end of spiral wire spring 23 rests against lever2 and tends to keep the extension 21 from pressing against knob 11. Attached to the upper part of lever 20, just below fly wheel 7 is aleather piece 20*, which serves to prevent the revolving of the fly wheel when the device is not to be operated. An extension rod 24 is attached by a suitable pin to pedal 25 which serves as a means for causing the sewing machine 26 to be thrown into and out of operation. The

numeral 27 represents a screw extending.

into gripping projection 10, which when removed, serves as a means for lubricating the shaft 2 upon which revolves fly wheel 7.

lVhen the attachment is out of operation the spring 23 forces lever 20 upwardly. thereby causing extension 21 to be released from contact with knob 11. and leather piece 20 to press against fly wheel 7. To cause the sewing machine to operate the pedal 25 is pressed down. thereby carrying with it, lever 20, wh ch causes extension 21 to be forced against knob 11. The wheel 4, which is secured. to shaft 2 and has attached thereto, pad 5, revolves with the movement of the shaft of the motor. As knob 11 is forced inward, the disc 13 is forced into con- I tact with the pads 5 and 8, thereby transferring the revolving motion of the wheel 4 to fly wheel 7 A suitable belt is connected to the sewing machine and the pulley 9,

and as the flywheel revolves the sewing machine is made to operate. The double gripping pads, enable the operation of the machine at any desired speed, dependent solely upon the downward force applied to the pedal 25. v

The attachment herein shown may be placed underneath the supporting frame of a sewing machine, the base 14 providing a convenient means for attaching the same to the frame. The attachment can be readily applied or removed from the driving shaft of a motor, and the construction is such that an attachment of this form can be applied to practically all ex'sting sewing machines and their motors.

I do not desire to be confined to the exact details and arrangements shown, as changes may be made in the form of construction without departing from the scope of the invention. 1

Having described my invention what 1 claim is:

1. A motor attachment for sewing machines comprising', in combination with a motor, a wheel secured to the shaft of a motor, having a gripping pad attached thereto, a fly wheel revolvably attached to the first mentioned wheel, a gripping pad secured to the inside surface of the fly wheel, a disc revolvably attached to the fly wheel and located between said pads, a knob secured to the fly wheel, a lever pivoted on a bar secured to a supporting base and engageable with the knob, means located on the lever for stopping the fly wheel from revolving, and means for moving the lever upward or downward whereby the device may be thrown into or out of operation.

2. In a mechanism of the class described, in combination with a sewing machine and a driving motor, a wheel secured to the driving shaft of a motor, a ripping pad secured to the wheel, a fly whee revolvably attached on the first named wheel, a gripping pad attached to the said fly wheel, a disc revolvably attached on the fly wheel and located between the two pads, a meansattached to the fly wheel and a sewing machine whereby the latter may be operated when the fly wheel revolves, and a lever for forcing the fly wheel toward the motor to cause the gripping pads and the disc to come into contact with each other.

3. In a mechanism of the class described, in combination, a sewing machine having a rotatable pulley member, a motor having a driving shaft, a wheel secured to the driving shaft, a gripping means secured to the wheel, a disc engageable with the gripping means, a fly wheel attached to the first name wheel and provided with .a separate gripping means engageable with the disc, a leverengageable with the fly wheel and provided with a means for stopping the fly wheel from revolving, and a separate means for moving the lever whereby the fly wheel may be moved into and out of operative relation with the disc and the first mentioned wheel. 4. In a mechanism of the class described, in combination, a power actuated shaft, a wheel rotatable thereby, a clutch member located in the wheel, a fly wheel rotatable by the clutch member, a lever for moving the fly wheel into .and out of operation with the clutch member, and means for transmitting motion from the fly wheel to a sewing machine.

5. In mechanism of the class described, in combination, a power actuated shaft, a wheel secured to the shaft, a fly wheel revolvably attached on the first named wheel, a clutch mechanism located between the two wheels for transferring motion from the first named wheel to the fly wheel, a lever en- -gageable with the fly wheel for forcing it BARNET GROSSBARD. 

